This document provides exercises on using prefixes to form new words from word roots. It includes a prefix table, examples of words formed from prefixes like "ex-", "pre-", "re-", "un-", "non-", and "half-", sentences using these words, definitions of words using prefixes, an example of a student finding another word using a prefix, and a paragraph using 8 words with prefixes.

3. Exercises
25.1 Choose one of the words from the prefix table to fit in these sentences.
1 This part of the restaurant is non-smoking.
2 I can't read this. Please __________ your
rewrite/redo
homework.
3 In _________ English we often say 'Hi'.
informal
4 I liked school but my sister was very _______ there.
unhappy
5 I bought two T-shirts because they were ________in
half-price
the sale.
6 Don't walk on that wall- the notice says it is _______
unsafe

4. 25.2 Write your own sentences to show what these words mean.
ex-wife ex-president redo
impossible pre-school
He and his two ex-wives are all good friends.
An ex-president is giving a lecture here tomorrow.
It is impossible to read his handwriting.
Pre-school children learn by playing.
This work is not very good. Please redo it.

5. 25.3 What do you think these words and phrases mean? Look at the table
on the previous slides to help you.
1 an ex-husband a husband who is now divorced from his wife.
2 pre-exam nerves nerves before an exam
3 an incorrect answer a wrong answer, an answer that is not correct
4 an unread book a book that has not been read
5 to retell a story to tell a story again
6 a half-brother a brother with one parent the same
7 an unfinished letter a letter that is not finished
8 a non-alcoholic drink a drink with no alcohol in it
9 to reread a book to read a book for a second time
10 to readdress a letter to send a letter to a new address (to forward a letter

6. 25.4 Find one more example of a word using the prefixes in the table. Use a
dictionary to help you. Write a phrase or sentence using your word.
ex: My exboss lives near me.
half: You stop at half-time. in a football match
non: a non-stick pan
in: an incomplete answer
im: an impolite question
pre: a pre-lunch drink
re: to repaint a room
un: an unanswered question

7. 25.6 Write a paragraph with at least eight of the example words from the
.
table
This paragraph is a rather silly story but it uses most of the words in the
table.
He is a very unhappy ex-president. He never sees his
ex-wife or his pre-school grandchildren. He lives in a
house which is a half-hour bus ride from the city centre
in an unsafe area. It is very crowded there and it is
impossible for non-residents to park there. He is
rewriting his autobiography for the third time in a very
informal style. I don't know why he redoes it so often.
He is sure that the book will only sell if it is sold at half-
price.

8. 25.6 Find the negative forms of these words. Use a dictionary if necessary.
1 possible imposible.
2 comfortable uncomfortable
3 safe unsafe
4 formal informal
5 smoking non-smoking
6 happy unhappy
7 polite impolite
8 correct incorrect